2 Word-processor mode for the editor: does dynamic
6 The Free Software Foundation, Inc.
8 Copyright (C) 1996 Paul Sheer
13 This file is part of the Midnight Commander.
15 The Midnight Commander is free software: you can redistribute it
16 and/or modify it under the terms of the GNU General Public License as
17 published by the Free Software Foundation, either version 3 of the License,
18 or (at your option) any later version.
20 The Midnight Commander is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU General Public License for more details.
25 You should have received a copy of the GNU General Public License
26 along with this program. If not, see <http://www.gnu.org/licenses/>.
30 * \brief Source: word-processor mode for the editor: does dynamic paragraph formatting
39 #include <sys/types.h>
48 #include "lib/global.h"
50 #include "src/setup.h" /* option_tab_spacing */
52 #include "edit-impl.h"
53 #include "editwidget.h"
55 /*** global variables ****************************************************************************/
57 /*** file scope macro definitions ****************************************************************/
59 #define tab_width option_tab_spacing
61 #define NO_FORMAT_CHARS_START "-+*\\,.;:&>"
62 #define FONT_MEAN_WIDTH 1
64 /*** file scope type declarations ****************************************************************/
66 /*** file scope variables ************************************************************************/
68 /*** file scope functions ************************************************************************/
69 /* --------------------------------------------------------------------------------------------- */
72 line_start (WEdit
* edit
, long line
)
80 p
= edit_move_backward (edit
, p
, l
- line
);
82 p
= edit_move_forward (edit
, p
, line
- l
, 0);
84 p
= edit_bol (edit
, p
);
85 while (strchr ("\t ", edit_get_byte (edit
, p
)))
90 /* --------------------------------------------------------------------------------------------- */
93 bad_line_start (WEdit
* edit
, long p
)
96 c
= edit_get_byte (edit
, p
);
98 { /* `...' is acceptable */
99 if (edit_get_byte (edit
, p
+ 1) == '.')
100 if (edit_get_byte (edit
, p
+ 2) == '.')
106 if (edit_get_byte (edit
, p
+ 1) == '-')
107 if (edit_get_byte (edit
, p
+ 2) == '-')
108 return 0; /* `---' is acceptable */
111 if (strchr (NO_FORMAT_CHARS_START
, c
))
116 /* --------------------------------------------------------------------------------------------- */
118 * Find the start of the current paragraph for the purpose of formatting.
119 * Return position in the file.
123 begin_paragraph (WEdit
* edit
, int force
)
126 for (i
= edit
->curs_line
- 1; i
>= 0; i
--)
128 if (line_is_blank (edit
, i
))
135 if (bad_line_start (edit
, line_start (edit
, i
)))
142 return edit_move_backward (edit
, edit_bol (edit
, edit
->curs1
), edit
->curs_line
- i
);
145 /* --------------------------------------------------------------------------------------------- */
147 * Find the end of the current paragraph for the purpose of formatting.
148 * Return position in the file.
152 end_paragraph (WEdit
* edit
, int force
)
155 for (i
= edit
->curs_line
+ 1; i
<= edit
->total_lines
; i
++)
157 if (line_is_blank (edit
, i
))
163 if (bad_line_start (edit
, line_start (edit
, i
)))
169 return edit_eol (edit
,
170 edit_move_forward (edit
, edit_bol (edit
, edit
->curs1
),
171 i
- edit
->curs_line
, 0));
174 /* --------------------------------------------------------------------------------------------- */
176 static unsigned char *
177 get_paragraph (WEdit
* edit
, long p
, long q
, int indent
, int *size
)
179 unsigned char *s
, *t
;
181 t
= g_try_malloc ((q
- p
) + 2 * (q
- p
) / option_word_wrap_line_length
+ 10);
183 t
= g_try_malloc (2 * (q
- p
) + 100);
187 for (s
= t
; p
< q
; p
++, s
++)
190 if (edit_get_byte (edit
, p
- 1) == '\n')
191 while (strchr ("\t ", edit_get_byte (edit
, p
)))
193 *s
= edit_get_byte (edit
, p
);
195 *size
= (unsigned long) (s
- t
);
196 /* FIXME: all variables related to 'size' should be fixed */
201 /* --------------------------------------------------------------------------------------------- */
204 strip_newlines (unsigned char *t
, int size
)
206 unsigned char *p
= t
;
215 /* --------------------------------------------------------------------------------------------- */
217 This function calculates the number of chars in a line specified to length l in pixels
223 return x
+= tab_width
- x
% tab_width
;
226 /* --------------------------------------------------------------------------------------------- */
229 line_pixel_length (unsigned char *t
, long b
, int l
)
231 int x
= 0, c
, xn
= 0;
240 xn
= next_tab_pos (x
);
254 /* --------------------------------------------------------------------------------------------- */
257 next_word_start (unsigned char *t
, int q
, int size
)
262 for (i
= q
; i
< size
; i
++)
281 /* --------------------------------------------------------------------------------------------- */
282 /** find the start of a word */
285 word_start (unsigned char *t
, int q
, int size
)
288 if (t
[q
] == ' ' || t
[q
] == '\t')
289 return next_word_start (t
, q
, size
);
298 if (c
== ' ' || c
== '\t')
304 /* --------------------------------------------------------------------------------------------- */
305 /** replaces ' ' with '\n' to properly format a paragraph */
308 format_this (unsigned char *t
, int size
, int indent
)
311 strip_newlines (t
, size
);
312 ww
= option_word_wrap_line_length
* FONT_MEAN_WIDTH
- indent
;
313 if (ww
< FONT_MEAN_WIDTH
* 2)
314 ww
= FONT_MEAN_WIDTH
* 2;
318 q
= line_pixel_length (t
, q
, ww
);
323 p
= word_start (t
, q
, size
);
325 q
= next_word_start (t
, q
, size
); /* Return the end of the word if the beginning
326 of the word is at the beginning of a line
327 (i.e. a very long word) */
330 if (q
== -1) /* end of paragraph */
337 /* --------------------------------------------------------------------------------------------- */
340 replace_at (WEdit
* edit
, long q
, int c
)
342 edit_cursor_move (edit
, q
- edit
->curs1
);
343 edit_delete (edit
, 1);
344 edit_insert_ahead (edit
, c
);
347 /* --------------------------------------------------------------------------------------------- */
348 /** replaces a block of text */
351 put_paragraph (WEdit
* edit
, unsigned char *t
, long p
, int indent
, int size
)
355 cursor
= edit
->curs1
;
357 while (strchr ("\t ", edit_get_byte (edit
, p
)))
359 for (i
= 0; i
< size
; i
++, p
++)
363 if (t
[i
- 1] == '\n' && c
== '\n')
365 while (strchr ("\t ", edit_get_byte (edit
, p
)))
368 else if (t
[i
- 1] == '\n')
371 edit_cursor_move (edit
, p
- edit
->curs1
);
373 edit_insert_indent (edit
, indent
);
375 cursor
+= edit
->curs1
- p
;
380 edit_cursor_move (edit
, p
- edit
->curs1
);
381 while (strchr ("\t ", edit_get_byte (edit
, p
)))
383 edit_delete (edit
, 1);
384 if (cursor
> edit
->curs1
)
390 c
= edit_get_byte (edit
, p
);
392 replace_at (edit
, p
, t
[i
]);
394 edit_cursor_move (edit
, cursor
- edit
->curs1
); /* restore cursor position */
397 /* --------------------------------------------------------------------------------------------- */
400 test_indent (WEdit
* edit
, long p
, long q
)
403 indent
= edit_indent_width (edit
, p
++);
407 if (edit_get_byte (edit
, p
- 1) == '\n')
408 if (indent
!= edit_indent_width (edit
, p
))
413 /* --------------------------------------------------------------------------------------------- */
414 /*** public functions ****************************************************************************/
415 /* --------------------------------------------------------------------------------------------- */
418 format_paragraph (WEdit
* edit
, int force
)
424 if (option_word_wrap_line_length
< 2)
426 if (line_is_blank (edit
, edit
->curs_line
))
428 p
= begin_paragraph (edit
, force
);
429 q
= end_paragraph (edit
, force
);
430 indent
= test_indent (edit
, p
, q
);
431 t
= get_paragraph (edit
, p
, q
, indent
, &size
);
437 if (strchr (NO_FORMAT_CHARS_START
, *t
))
442 for (i
= 0; i
< size
- 1; i
++)
446 if (strchr (NO_FORMAT_CHARS_START
"\t ", t
[i
+ 1]))
454 format_this (t
, q
- p
, indent
);
455 put_paragraph (edit
, t
, p
, indent
, size
);
458 /* Scroll left as much as possible to show the formatted paragraph */
459 edit_scroll_left (edit
, -edit
->start_col
);
462 /* --------------------------------------------------------------------------------------------- */